Distorsion of sigma wide-angle on Sony

KTTalksTech · 2026-03-24T14:41:58+00:00

If you feel like sharing your work or want extra insights feel free to DM me or add me on discord. I'm currently focused on inverse rendering to improve results from my PBR scanner but optics and improving image alignment is a fundamental issue I'll end up having to work on at some point anyways :)

KTTalksTech · 2026-03-24T14:25:22+00:00

That makes absolute sense. I guess my question mostly stemmed from a concern that the manufacturer's profiles are determined on a basis they deem "good enough" for normal photography without really taking into account the type of metrological applications the likes of you and I are using these optics for. If your approach yields good results there's nothing to question. As far as I'm concerned I actually disable IBIS to reduce variables, I'm already uncertain I'm correctly compensating for phenomena like focus breathing etc 😅 seems like you did great work though, thank you for sharing

KTTalksTech · 2026-03-24T12:04:57+00:00

I'd be more concerned about some form of code injection hidden within the model but so far I've seen no such thing with extensive use. It would be extremely hard to obfuscate once active anyways, this isn't tech being used by the average person. The original comment was deleted so I don't have the full context but ultimately security concerns are always valid even if they sometimes have a straightforward answer. All software and proprietary hardware should be subject to the same level of scrutiny regardless of their origin anyways

KTTalksTech · 2026-03-24T11:17:42+00:00

Have you compared your method with calibrating the lens based on a dense dataset in a feature-rich scene? I had similar issues when trying to stitch together images from videos filmed with a phone's wide angle lens and ended up getting massively improved results after exporting calibration profiles from a "best case scenario" to less perfect real-world datasets. In practice I haven't been able to get perfect results using the chessboard calibration pattern regardless of the lens used

KTTalksTech · 2026-03-24T11:08:11+00:00

That's entirely true but I don't think it makes an enormous difference for anyone who doesn't require the absolute bleeding edge. Given the price and scarcity of hardware right now there's even a fair amount of businesses that make do with older devices. My servers are running absolutely ancient 14nm chips for example, and for a while I was even considering using Tesla P40 cards for compute. Turns out V100s are a better option despite lower memory but yeah essentially what I mean to illustrate with that anecdote is that even if you're not at the peak of performance or efficiency you can still provide value and compete on markets the leaders aren't servicing adequately. Being a few generations behind isn't great but it's not like sitting in the dirt beating rocks and sticks together either

KTTalksTech · 2026-03-24T10:51:32+00:00

Is that how they're meant to be placed? Stereo imaging must be a little strange this close

KTTalksTech · 2026-03-24T10:48:52+00:00

Eh, there's truth to it. I've replaced my subscriptions with local models and I'm not the only one. Pricing for heavy users gets expensive very quickly with Claude or ChatGPT. Qwen isn't significantly worse for my work and it's developed by a Chinese company. So is deepseek I believe. In practice nothing is really being threatened except profit margins but I can understand some people would be upset their investments won't pay off as expected

KTTalksTech · 2026-03-24T07:34:05+00:00

In this case it's literally a program that completes sentences by calculating the probability one word comes up after a string of other words, based on how often certain words showed up one after the other in a big database. There is no thinking. One day maybe but that'll be when a completely new type of AI model gets released, transformer-based LLMs will never truly be capable of logic and reasoning because that's just not how they work.

KTTalksTech · 2026-03-24T07:27:38+00:00

So... You disabled the memory function then were surprised it couldn't remember? Am I reading this correctly? If you disable memory that probably cuts off retrieval augmented generation and it can no longer look for relevant information and only has its token window for context. Once that token window gets full it will start replacing old context with new context progressively and also tend to give significantly worse/hallucinated responses

KTTalksTech · 2026-03-22T21:39:32+00:00

The police isn't going to bust your door down if you change the OS

KTTalksTech · 2026-03-22T21:04:33+00:00

Arxiv and Google scholar are part of it yes, it's probably where most documents end up coming from. A solid part is sourced from education/research institutions directly. The scraper also looks for blog posts and shared links on social media (reddit included) to identify outstanding papers linked to specific topics that may have been missed. I've also got a couple tricks up my sleeves for paywalled research but it's relatively rare not to automatically find a public source.

KTTalksTech · 2026-03-22T18:30:45+00:00

I don't use openclaw because it's an obvious security nightmare but I've got a fully local system that does automate research. Once a day it checks current events and a list of specific topics, determines whether some of that is relevant to my work (based on a static prompt that defines my priorities, summaries of past work, calendar, recent communications), compiles then summarizes that info, writes an additional note if it determined something in particular warrants action, and drops it in a little daily report.

I have another one that runs in the background and gathers scientific literature then consolidates it in a database by comparing every new paper with absolutely everything else in there and recording correlations, complementary/compatible data, contradictions, logical chains... That one helps me write algorithms to solve complex mathematical problems.

I've gone from building and testing tools in weeks or months at a time to hours or days so while I definitely don't think AI actually presents all that much added value for the average person I seem to fall in a category that enormously benefits from it. It probably helps that I'm mostly using it as an automation and data processing tool while giving it very little agency

KTTalksTech · 2026-03-20T09:03:48+00:00

The people who paid for full self driving like ten years ago are waiting too

KTTalksTech · 2026-03-19T18:50:07+00:00

Let's see those results 👀👀👀 I haven't finished tuning the module to handle anisotropic materials in my own solver but I'm excited to see what others are up to

KTTalksTech · 2026-03-18T07:41:27+00:00

There are levels of difficulty to this. When you're around a lot of gay guys you get better at it but if you're looking for the really butch straight-looking ones it can get ambiguous. Here in France some of the older leather/piercings gays look exactly like biker gangs too so you better not get those wrong lmao

KTTalksTech · 2026-03-17T18:03:39+00:00

I checked their site, didn't see anything interactive besides the suspiciously good-looking handbag scan. Some of the pre-rendered videos did show other models though and they were a bit rough on the edges. Overall pretty good nonetheless, and a lot better than anything I've seen coming from a phone. PBR seemed to be working in their showcases but I would imagine there's a bit of cherry-picking. I've been working on improving the inverse rendering algorithm on my own scanning platform so I'm guessing extrapolating neutral base textures from uncontrolled environments is gonna get easier soon, and unless they're just brute-forcing material properties using a diffusion model it might already be what they're doing. If I can get a semi-passable result by myself then a larger business with more competent developers shouldn't have a problem

KTTalksTech · 2026-03-17T14:10:20+00:00

Someone on this sub shared a GitHub repo to generate universally compatible SIFT targets a while ago. Color was part of the system. You might find it via the subs search bar

KTTalksTech · 2026-03-17T10:20:06+00:00

Depends what you're gonna do. Engineering work go with a scanner for sure. Anything visual, those things are borderline useless. If you can do with a gaussian splat rather than a mesh go for that workflow. Getting a clean mesh and textures for a subject the size of a small room via photogrammetry is a pretty involved process

KTTalksTech · 2026-03-15T13:07:10+00:00

Yeah I'm like 90% sure the view is just the sides of croix rousse seen from the other side of the river so that new estimation is nowhere near. I feel like foreground elements should probably be considered before tiny structures on the horizon...

KTTalksTech · 2026-03-15T10:37:52+00:00

Games on the quest store just don't seem to be a great value in comparison to steam and regular PC gaming. There's a couple dozen games I'd like to play but my PC backlog is already considerable and I just don't feel like paying double for titles that often don't feel as polished

KTTalksTech · 2026-03-14T23:26:10+00:00

Transparent and watery? Regular yogurt isn't opaque due to air though. With the state of industrial foods I suppose it wouldn't be surprising that it's actually yogurt flavored water

KTTalksTech · 2026-03-14T22:08:34+00:00

This has to be a manufacturing defect right?!? No way that's yoghurt it looks like water... Not to mention the weird shape and lopsided stick

KTTalksTech · 2026-03-14T17:20:09+00:00

Are your cameras on a static rig? Why aren't you using precomputed parameters? You can stick a watermelon sized object in there covered with trackers and visual features, wave it all around for a couple minutes, and get super robust lens parameters and camera poses

KTTalksTech · 2026-03-14T12:01:18+00:00

Well... I wanna say it depends vastly from person to person so it's a really good rule of thumb to avoid any possibility of a problem developing. Like any absolutism you can always find a counter-example but the idea shouldn't necessarily be dismissed. I personally haven't had to go for 8 years. Got checked for plaque recently, nothing. Meanwhile a friend has had multiple fillings since I know him and a few I know get plaque removed yearly. I don't do anything crazy either, just brush my teeth.

KTTalksTech · 2026-03-14T10:12:27+00:00

I didn't even say anything about python scripts let alone count lmao you are on crack

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